<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Test02</title>
</head>
<body>
<script type="text/javascript">
    let obj = {
        "a": 10,
        "b": 20
    };

    let proxy = new Proxy(obj, {
        get: function (target, propKey, receiver) {
            return Reflect.get(target, propKey, receiver) + 100;
        }
    });

    console.log(proxy.a);
</script>
</body>
</html>